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Lindsay Lohan's court hearing is less than three hours away and she still has not arrived in Los Angeles ... TMZ has learned.

As TMZ first reported, LiLo hopped off her scheduled flight from New York to Los Angeles just before take off last night because she felt the plane was unsafe.

Lindsay eventually found a flight, tweeting at around 4:00 AM PT and thanking Mr. Pink -- an energy drink company -- for lending her a private jet.

According to our sources, the flight won't land in Los Angeles until around 6:30-7:00 AM PT ... meaning Lindsay has roughly 1.5 hours to make it to court, which starts at 8:30 AM PT. It might be enough time, but you have to factor in that Lindsay needs to make herself "camera ready."

And then there's this ... we know Lindsay's plane is set to land at the airport in Van Nuys. That means she has to travel around 20 miles to get to the hearing today at the Airport Courthouse. And it's gonna be rush hour!

According to our sources, Lindsay is not alone on the flight. She's traveling with her ex-assistant Gavin. He was the one who rolled on Lindsay and told the cops she was driving the car (despite her claims otherwise). The incident played a major role in their decision to charge her with lying to police.

Lindsay could have avoided all of this if she stayed on her original flight to LA. Even though it took off an hour late and was diverted to Las Vegas ... it still arrived in Los Angeles last night at 11:30 PM.

But if Lindsay made smart decisions, we wouldn't be in this mess in the first place.

UPDATELindsay Lohan will absolutely, positively be LATE for her trial TMZ has learned ... and the judge could issue a bench warrant for her arrest on her first day of trial.

We've learned ... the private jet that is carrying the infamous defendant is scheduled to land at 8:11 AM in Van Nuys, 20 miles from the courthouse. That means at the time of touchdown, assuming she lands on time, she will have 19 minutes to get to the courthouse in the middle of rush hour traffic. Translation: No way in hell.

Sources tell us ... the jet was delayed at JFK in NYC and didn't go wheels up until 6 AM EDT.

There are 2 SUVs waiting at Van Nuys airport to take Lindsay and her entourage to court.

One more complication .... Lindsay left all of her luggage on her original commercial flight. Someone has already retrieved the bags at LAX and has taken them to the Van Nuys Airport. Lindsay will change clothes in the car.

8:13 AM PTWe're told the private jet carrying Lindsay has diverted to LAX -- which will put her much closer to the courthouse, and give her a fighting chance to actually make it on time. The clock is ticking ...